Check out the free online version of James Wilson’s 1915 “Lowland Scotch as spoken in the lower Strathearn district of Perthshire” A meticulous investigation of the speech of the Perthshire village of Dunning a century ago. A personal connection as I lived as a bairn in Dunning for 5 years and learned much of my ain Scots there. Includes pronunciation, grammar, wordlists, sayings, idioms, expressions. Legend has it this was the book that inspired Hugh MacDiarmid to start screivin awa in Scots, and I’m not surprised. As a bonus uses a wonderful phonetic orthography, by far the best writing system for Scots I have ever seen. https://archive.org/details/lowlandscotchass00wilsuoft